Begin refactoring backfilling and preparation operations into setup and start adding encryption metadata to models

backend/src/validation/config.ts

@@ -0,0 +1,21 @@
+import { InternalServerError } from "../utils/errors";
+  
+/**
+ * Validate that the encryption key [encryptionKey] is in base64 format and 256-bit
+ * @param {String} encryptionKey - the encryption key to validate
+ */
+export const validateEncryptionKey = (encryptionKey: string): Buffer => {
+
+    const keyBuffer = Buffer.from(encryptionKey, 'base64')
+    const decoded = keyBuffer.toString('base64');
+
+    if (decoded !== encryptionKey) throw InternalServerError({
+        message: 'Failed to validate the format of the encryption key. Please check that it is in base64 format.'
+    });
+    
+    if (keyBuffer.length !== 32) throw InternalServerError({
+        message: 'Failed to validate that the encryption key is 256-bit. Please check that it is 256-bit.'
+    });
+
+    return keyBuffer;
+};

backend/src/validation/index.ts

@@ -0,0 +1 @@
+export * from './config';